Drag the dots so that the lines that they join up do not intersect. Starts out really easy, quickly gets maddeningly complicated -- but always doable. There's no one correct solution, you just have to keep plugging away at it.
It's a really compelling concept that I've played before, but it just jumped back up to the top of Digg and I ended up sucked right back in.
I'm surprised none of us has blogged this yet, to be honest. Had to get it in here.
Planarity [Planarity.net]
